Background

Dr. Donald M. Carlton, Ph.D., was the President and Chairman of Radian Corporation from 1969 to January 1996. Dr. Carlton served as President and Chief Executive Officer of Radian International LLC, an Austin, Texas-based engineering and technology firm that is a subsidiary of URS Corporation from January 1996 to December 31, 1998. He has been a Director of National Instruments Corporation since 1994. He has been a Director of AEP Utilities Inc. (formerly, Central & ... South West Corp.) since 1994. He serves as Director of Signature Science, LLC. He serves as a Director of Concert Investment Series Funds, New York. He serves as a Trustee of Citi Fund Management Inc. - Investment Manager of Liquid Reserves Portfolio. He serves as a Trustee of 26 mutual funds in the Smith Barney/Citi fund complex. He is a Director of AEP Utilities, Inc. He served as a Director of Temple-Inland Inc. since August 1, 2003, and American Electric Power Co. Inc., a holding of AEP Texas Central Co., and Indiana Michigan Power Company since 2000. He served as a Director of Valero Energy Corporation. He has also served on several boards of The University of Texas at Austin, including chairing the College of Natural Sciences Foundation Advisory Council in 1998. He holds a B.A. degree in Chemistry from the University of St. Thomas in Houston in 1958 and Ph.D. degree in Organic Chemistry from The University of Texas at Austin in 1962.

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